SCHEDULES OF BARS

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• Q1: Define reinforcement.
  Ans: The steel bars provided in concrete structures are known as reinforcement.
• Q2: Write the types of reinforcement.
  Ans: The types are as follows:

  • ➔ According to Shape:
    • ➔ Round
    • ➔ Square
    • ➔ Rectangle
    • ➔ Hexagon
    • ➔ Octagon
  • ➔ According to Surface:
    • ➔ Plain Bars
    • ➔ Deformed Bars
  • ➔ According to Strength:
    • ➔ Grade 40
    • ➔ Grade 60
    • ➔ Grade 75
    • ➔ Grade 90
  • ➔ According to Material:
    • ➔ Mild Steel
    • ➔ Medium Carbon Steel
    • ➔ High Carbon Steel
  • ➔ According to Use:
    • ➔ Tensile Steel
    • ➔ Compression Steel
    • ➔ Shear Steel
  • ➔ According to Stress:
    • ➔ Ordinary Reinforcement
    • ➔ Pre-stressed Reinforcement
• Q3: Define plain bars.
  Ans: Plain bars are also known as round bars. They have smooth surfaces and are generally not preferred for reinforced concrete structures due to their weaker bond with concrete.
• Q4: Define deformed bars.
  Ans: Deformed bars have ribs or indentations on their surface, which improve their bond strength with concrete, making them more effective in resisting tension and shear forces.
• Q5: Define the purpose of providing reinforcement.
  Ans: The purpose of reinforcement is to improve the tensile strength of the structure.
• Q6: Write the purpose of ribs in bars.
  Ans: The ribs are provided in bars to provide friction and better grip.
• Q7: Write the measuring unit and paying unit of reinforcement.
  Ans: The measuring unit of reinforcement is “quintals” while the unit of payment is “per cwt”.
• Q8: Define lateral ties.
  Ans: These are separate small diameter bars/steel binders bent around the longitudinal bars of a square or rectangular column. The main purpose of lateral ties is to keep the longitudinal bars in place.
• Q9: Define helical ties.
  Ans: These are separate small diameter bars/steel binders bent around the longitudinal bars of a circular column in the form of a helix. It is termed as spiral or helical reinforcement or helical ties.
• Q10: Define longitudinal bars.
  Ans: The bars running along the length of the column are allied longitudinal bars.
• Q11: Define pitch of lateral ties.
  Ans: The distance between the centers of the two successive lateral ties is called pitch.
• Q12: Define concrete cover.
  Ans: Concrete cover, in RCC, is the minimum distance between the outer surface of the concrete and the nearest reinforcing steel (rebar).
• Q13: Write 4 advantages of RCC.
  Ans: The advantages are as follows:

  • ➔ R.C.C structure is durable, economical, water resistant and fire resistant.
  • ➔ It can be molded to any shape & size.
  • ➔ It gives a good aesthetic appearance to structure and size.
  • ➔ Being rigid material, it can bear shocks of earthquake.
  • ➔ Construction of all engineering structures is possible is easy with R.C.C.
• Q14: Write some disadvantages of using RCC.
  Ans: The disadvantages are as follows:

  • ➔ The initial cost of R.C.C is high.
  • ➔ The dead load of the structure is increased.
  • ➔ Construction requires a large quantity of timber and steel plates for form work.
• Q15: What is Grade of steel?
  Ans: The strength of steel is known as the Grade of steel. A steel of grade 40 has strength of 40,000 psi.
• Q16: What is the commonly used steel grade?
  Ans: Commonly used steel grades are 40 and 60.
• Q17: Define BBS.
  Ans: BBS is known as Bar Bending Schedule. It is a schedule that contains all the information of reinforcement (length, grade, amount etc.) used in the construction project.
• Q18: Why is the bar bending schedule prepared?
  Ans: A Bar Bending Schedule is prepared to get the idea of the specifications and cost of the reinforcement used in the project.
• Q19: Define crank bar.
  Ans: A Crank bar is a type of main bar that is bent at an angle of 45°.
• Q20: Define Main bars.
  Ans: Main bars are provided in the shorter span of the slab.

  • ➔ Main bars have larger diameter than distribution bars.
  • ➔ Main bars help to transfer load of slab to beam or column.
  • ➔ Main bars are usually Crank bars.
• Q21: Define Distribution bars.
  Ans: Distribution bars are provided in the longer span of the slab.

  • ➔ Distribution bars have smaller diameter than main bars.
  • ➔ Distribution bars help to distribute load across the slab.
  • ➔ Distribution bars are also called Temperature bars.
• Q22: Write the diameter of #4 bar.
  Ans: The diameter of # 4 bar is 4/8”.
• Q23: Calculate area of ¾” diameter bar.
  Ans:
• Q24: Write the formula to calculate Number of Bars in an RCC Slab.
  Ans:
• Q25: Write the formula to calculate length of straight bar in a Slab
  Ans: